Partially answering my own questions, Redilast sells directly at Redilast.com. But the cells are very expensive.
Mitro posted a 3A test graph of a "Sanyo 2600 li-poly" vs an AW. I can't find any specific reference on the internet to a 2600mah lithium polymer battery made by Sanyo, and I didn't find a specific model reference from him, so I'm not sure it's the same cell:
http://i1117.photobucket.com/albums/k588/mitro74/bt/aw2900/aw29s261.gif
As well as a 3A test with others:
http://i1117.photobucket.com/albums/k588/mitro74/bt/CK%20IMR%202250/18650s3a.gif
from this thread:
https://budgetlightforum.com/t/-/2325#comment-48561
Old4570's CPF review shows the "Sanyo 2600" second to the Callie's Kustoms Panasonic CGR18650CH in amps output on an XM-L light of his, of the ones he tried. I'm assuming that was UR18650FM cell. He probably has the same review posted here.
Interesting note, Callie's Kustoms apparently posts on CPF as user xxllmm4.
In the same thread, a few posts down, Old4570 gets a post deleted, then gets his account suspended by DM51! And for what? For "baiting"! Yes, that's right! "Baiting!" I don't even know what that means, LOL! Laughing, altho it's not funny. I know how he feels. (For those who don't know, Old4570 is one of the most respected BLF members, battery-holic and -tester.)
I also did some comparisons on my Panasonic NCR and CGR versus others, and indeed the Pannies do deliver more current, but "how much more" apparently depends on the driver too. On one flashlight with the CGR's I in fact was able to go from 2.4A to 2.9 amps like I'd hoped. However, on another the gain was modest, from 2.1A to 2.3, not very significant for a battery double the cost. The NCR was in the middle at 2.17A. Someone just looking for max amperage, not runtime, should choose CGR-CH over NCR. Will have to see about the Sanyos.
CnQualityGoods has the best price I've seen on Sanyo 2600's, I'm again assuming/hoping these are UR18650FM. $5.90ea, not sure if that includes shipping
http://www.cnqualitygoods.com/goods.php?id=1184
Also saw an unusual cell, light blue Ultrafire XSL 260, "Japan version". I think it's wrong to not clarify what that means, and let people think Ultrafire is selling a protected battery with a Japanese-made cell. A CPF member emailed CQG and got the reply implying that the cells were not made in Japan, stating they were intended for export TO Japan, and supposedly "higher quality process". Seems to me CQG should say that right on their page. And I wonder why UF would need/want to make a cell specifically for Japan--do they have stricter rules on parts or labeling?